Drinking water quality · 2024
· Verified
· PWSID IL1970450
What's in Joliet, IL tap water
Every one of the 11 core regulated contaminants reported for Joliet, IL came in below its federal limit.
- !11 of 27 core regulated contaminants reported — 16 never appear in this report
- ✓Nothing over a federal limit
- ✓No open federal violations
+How this score is calculated
Every system starts at 100. Points come off for measured levels, for the federal violation record, and for how much of the core regulated set the utility actually reported. All three inputs are the utility's own published numbers and EPA's own records.
- −0 contaminants at or above a federal limit
- −0 contaminants within 20% of a limit
- −0 open health-based violations
- −0 open monitoring / reporting violations
- −2 health-based violations resolved in the last 5 years
- −13 core regulated contaminants never reported (11/27)
A 90–100 · B 80–89 · C 70–79 · D 60–69 · F below 60. A system reporting under a third of the core set is capped at C however clean its numbers look — a short report is not a clean bill of health.
Full grading methodology, constant for constant →+16 contaminants were measured and came in below the limitShow all
| Contaminant | Measured | Federal limit |
|---|---|---|
| Combined Radium | 3.92 pCi/L | 5 pCi/L |
| Copper | 0.901 mg/L | 1.3 mg/L |
| Gross Alpha | 10.2 pCi/L | 15 pCi/L |
| Chloramine | 2.2 mg/L | 4 mg/L |
| Lead | 0.00777 mg/L | 0.015 mg/L |
| Fluoride | 1.41 mg/L | 4 mg/L |
| Arsenic | 1.96 ug/L | 10 ug/L |
| Benzo(a)pyrene | 20 ng/L | 200 ng/L |
| Selenium | 2.79 ug/L | 50 ug/L |
| Chromium | 4.24 ug/L | 100 ug/L |
| Uranium | 1.06684 ug/L | 30 ug/L |
| Cyanide | 2.8 ug/L | 200 ug/L |
| Barium | 0.023 mg/L | 2 mg/L |
| Manganese | 200 ug/L | — |
| Sodium | 119000 ug/L | — |
| Zinc | 0.00934 mg/L | — |
What this report doesn't tell you
16 of the 27 contaminants a community water system normally reports do not appear anywhere in Joliet, IL's data. Absent is not the same as absent-from-the-water — it means nobody published a number.
+Full detail: PFAS testing, water source, historical monitoring, and the federal violation record
Where your water comes from · EPA SDWIS
Joliet, IL's drinking water comes from ground water, drawn from 26 sources.
Source
- WELL 5D
- WELL 6D
- WELL 7D
- WELL 8D
- + 22 more
Treatment
- TP09-HMO WELLS 11D,23D
- TP10-HMO WELL 12D
- TP11-HMO WELL 15D
- + 8 more
Distribution
Compliance history
Federal Safe Drinking Water Act violation & enforcement records (EPA SDWIS). A violation is a regulatory determination by the state or EPA — separate from the measured levels above.
- Maximum contaminant level exceededHealth-based39 violations on record · most recent Oct 2007resolved
- Treatment technique violationHealth-based3 violations on record · most recent Oct 2024resolved
Source: EPA SDWIS / ECHO. View the full federal record on EPA ECHO ↗